package com.sunkq.atomic;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;

public class SpinLockDemo {

    AtomicReference<Thread> atomicReference = new AtomicReference<>();

    public void myLock(){
        Thread thread = Thread.currentThread();
        System.out.println(Thread.currentThread().getName()+"\t come in");
        while (!atomicReference.compareAndSet(null,thread)){

        }
    }

    public void myUnlock(){
        Thread thread = Thread.currentThread();
        atomicReference.compareAndSet(thread, null);
        System.out.println(Thread.currentThread().getName()+"\t over");

    }

    public static void main(String[] args) {
        SpinLockDemo spinLockDemo = new SpinLockDemo();
        new Thread(()->{
            spinLockDemo.myLock();
            try { TimeUnit.SECONDS.sleep(3);  } catch (InterruptedException e) {e.printStackTrace();}
            spinLockDemo.myUnlock();
        },"A").start();

        new Thread(()->{
            spinLockDemo.myLock();
            spinLockDemo.myUnlock();
        },"B").start();
    }
}
